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    2 vulnerabilities found for lz4_flex by PSeitz

    CVE-2026-32829 (GCVE-0-2026-32829)

    Vulnerability from nvd – Published: 2026-03-20 00:49 – Updated: 2026-06-30 12:07
    VLAI
    Title
    lz4_flex: Decompression can leak information from uninitialized memory or reused output buffer
    Summary
    lz4_flex is a pure Rust implementation of LZ4 compression/decompression. In versions 0.11.5 and below, and 0.12.0, decompressing invalid LZ4 data can leak sensitive information from uninitialized memory or from previous decompression operations. The library fails to properly validate offset values during LZ4 "match copy operations," allowing out-of-bounds reads from the output buffer. The block-based API functions (`decompress_into`, `decompress_into_with_dict`, and others when `safe-decode` is disabled) are affected, while all frame APIs are unaffected. The impact is potential exposure of sensitive data and secrets through crafted or malformed LZ4 input. This issue has been fixed in versions 0.11.6 and 0.12.1.
    Severity
    8.2 (High)
    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
    SSVC
    Exploitation: none Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-201 - Insertion of Sensitive Information Into Sent Data
    • CWE-823 - Use of Out-of-range Pointer Offset
    Assigner
    References
    Impacted products
    Show details on NVD website
    To clipboard 

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    CVE-2026-32829 (GCVE-0-2026-32829)

    Vulnerability from cvelistv5 – Published: 2026-03-20 00:49 – Updated: 2026-06-30 12:07
    VLAI
    Title
    lz4_flex: Decompression can leak information from uninitialized memory or reused output buffer
    Summary
    lz4_flex is a pure Rust implementation of LZ4 compression/decompression. In versions 0.11.5 and below, and 0.12.0, decompressing invalid LZ4 data can leak sensitive information from uninitialized memory or from previous decompression operations. The library fails to properly validate offset values during LZ4 "match copy operations," allowing out-of-bounds reads from the output buffer. The block-based API functions (`decompress_into`, `decompress_into_with_dict`, and others when `safe-decode` is disabled) are affected, while all frame APIs are unaffected. The impact is potential exposure of sensitive data and secrets through crafted or malformed LZ4 input. This issue has been fixed in versions 0.11.6 and 0.12.1.
    Severity
    8.2 (High)
    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
    SSVC
    Exploitation: none Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-201 - Insertion of Sensitive Information Into Sent Data
    • CWE-823 - Use of Out-of-range Pointer Offset
    Assigner
    References
    Impacted products
    Show details on NVD website
    To clipboard 

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          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-201",
              "description": "CWE-201: Insertion of Sensitive Information Into Sent Data",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-823",
              "description": "CWE-823: Use of Out-of-range Pointer Offset",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-20T00:49:12.893Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/PSeitz/lz4_flex/security/advisories/GHSA-vvp9-7p8x-rfvv",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/PSeitz/lz4_flex/security/advisories/GHSA-vvp9-7p8x-rfvv"
        },
        {
          "name": "https://github.com/PSeitz/lz4_flex/commit/055502ee5d297ecd6bf448ac91c055c7f6df9b6d",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/PSeitz/lz4_flex/commit/055502ee5d297ecd6bf448ac91c055c7f6df9b6d"
        },
        {
          "name": "https://rustsec.org/advisories/RUSTSEC-2026-0041.html",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://rustsec.org/advisories/RUSTSEC-2026-0041.html"
        }
      ],
      "source": {
        "advisory": "GHSA-vvp9-7p8x-rfvv",
        "discovery": "UNKNOWN"
      },
      "title": "lz4_flex: Decompression can leak information from uninitialized memory or reused output buffer"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-32829",
    "datePublished": "2026-03-20T00:49:12.893Z",
    "dateReserved": "2026-03-16T17:35:36.698Z",
    "dateUpdated": "2026-06-30T12:07:41.129Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}